Vented ski with modified keel

ABSTRACT

A ski having vents for venting snow from beneath the ski to a location above the ski and a modified keel that provides for greater and easier directional control over the ski relative to a conventional ski.

BACKGROUND INFORMATION Field of the Invention

The invention relates to skis, particularly those used to travel on snow and attached to ski-mounted vehicles such as snowmobiles.

Discussion of Prior Art

Snow skis are used by individuals and machines to move, or glide, across a snowy surface. Snowmobiles, in particular, are ski-mounted vehicles that are constructed to travel across snow and ice. As is generally known, the snowmobile is driven by an endless drive track arranged at the rear end of the underside of the snowmobile. The front end of the snowmobile is customarily supported on two skis, which glide across the surface of the snow or ice. The skis typically have a carbide runner or runners and a keel that runs along a substantial portion of the bottom surfaces, to help keep the snowmobile traveling along a smooth track and to help steer.

The conventional keel runs nearly the entire length of the ski, being generally flat with a slight tapper on the front end, and typically has a depth of about one inch. While the exact dimensions of the conventional ski varies based on a number of factors, it is common for a ski to be approximately 45 inches in length with a keel that is approximately 42 inches in length. While the runners and keel generally help to control the snowmobile, in certain situations snow may become impacted beneath the ski and cause the ski to lift off the surface, thereby causing a loss in the ability to steer and control the snowmobile. Some skis are designed to compensate for this by having a much deeper keel, some having a depth of around 4 inches and that run nearly the entire length of the ski. However, while these deeper keels maintain contact with the snow they are extremely difficult to maneuver, requiring a great deal of strength and often an uncomfortable motion to change the direction of the snowmobile.

What is needed, therefore, is a ski that is designed to prevent snow from becoming impacted beneath the ski. What is further needed is a ski that enables greater control without requiring a greater degree of effort.

BRIEF SUMMARY OF THE INVENTION

The invention is a vent for a ski, or a vented ski having one or more vents, and modified keel that prevents snow from becoming impacted beneath the ski and enables greater and easier control over the ski. The vented ski with modified keel is particularly advantageous when used on a ski-mounted vehicle such as a snowmobile.

The one or more vents may be inserted into openings in the ski body, typically on either side of the keel and near a mid-point length-wise in the ski body, or the vents may be attached to an outer portion of the ski, or the vents may be formed as a part of the ski. The vents are typically closed on a top surface, which acts as a guide surface, and has at least one side, such that the vent directs snow away from the ski. As the ski travels across the snow, snow that normally may become impacted under the ski enters the vent and is directed away from the ski. The closed side or sides of the vent may be largely straight such that snow is directed straight off the back of the vent, or, alternatively, the sides may be open or include directional guides to direct the snow out and away from the snowmobile or inwards towards the snowmobiles track.

The modified keel is a short but deep keel, measuring less than 16 inches in length, preferably approximately 12 inches in length, and potentially as little as 4 inches to 6 inches in length. The keel generally has a depth of approximately 2 inches to approximately 4 inches, but may be shorter or deeper for certain purposes.

Together, the vents and modified keel create a ski having improved connection to a snowy surface while also allowing an operator to easily change direction and control the overall movement of the ski-mounted vehicle in a variety of conditions.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is described with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. The drawings are not drawn to scale.

FIG. 1 is a top view of vented ski according to the invention having two vents.

FIG. 2 is bottom view of the vented ski having two vents.

FIG. 3 is a bottom view of the vented ski showing the vents.

FIG. 4 is a side view of the vent showing the inner side.

FIG. 5 is a side view of the vent showing the outer side.

FIG. 6 is a bottom view of the vent.

FIG. 7 is a bottom view of a vented ski having a modified keel.

FIG. 8 is a bottom view of the vented ski showing the modified keel and the two vents.

FIG. 9 is a side view of the ski with the modified keel and vents.

FIG. 10 is a front view of the ski with the modified keel and vents.

FIG. 11 is a top view of the ski having vent outside of the ski body.

FIG. 12 is a perspective view showing the top and side of a ski having a vent that extends out of the tail end of the ski.

FIG. 13 is a perspective view showing the bottom and side of the ski having vents that extend out of the rear of the ski.

FIG. 14 is a bottom plan view of the ski having vents that extend out the tail of the ski.

FIG. 15 is a bottom perspective view of a ski having blades.

FIG. 16 is a side view of a ski having blades.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will now be described more fully in detail with reference to the accompanying drawings, in which the preferred embodiments of the invention are shown. This invention should not, however, be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be complete and will fully convey the scope of the invention to those skilled in the art.

FIGS. 1-3 illustrate a vented ski 100 according to the invention, including a conventional ski 10 having at least one vent 40. When affixed to a ski-mounted vehicle such as a snowmobile (not shown), the skis 10 operate in the normal course, gliding across a snowy surface and allowing an operator to control the direction of the snowmobile. As the skis 10 glide along the surface, snow from beneath the skis 10 is vented through the vents 40 and out and away from a top surface 11 of the skis. In this manner, snow no longer becomes impacted beneath the ski 10 and the operator is able to maintain greater control of the snowmobile. Additionally, depending on the design of the vents 40, it is possible that the vented snow may cool parts of the snowmobile. In the embodiment shown in FIGS. 1-10 the vents 40 are inserted into openings 28 in the ski 10, however, the vents 40 need not be inserted into the ski 10 and may alternatively be attached to the outer side of the ski 10 as shown in FIG. 11. As yet another alternative, the vents 40 may be inserted into carve outs in the ski that extend all the way through a tail end of the ski as shown in FIGS. 12-14. The vents 40 may also be formed as an integral part of the ski.

The ski 10 has a ski body 12 that is a molded, pressed, or stamped component. The ski body 12 has a leading end 14 and a trailing end 16 and a bottom surface 24 that is the ski glide surface. A keel 26 typically extends along the center of the bottom surface running from the leading end 14 to the trailing end 16. The ski 10 also typically has a carbide runner or runners that run along a portion of the bottom surface 24 that, in addition to the keel 26, helps control the direction of the snowmobile. Often, the ski 10 also has two side walls 18 extending upward from a ski floor 22 and that provide structural support and may be used to secure the ski to the snowmobile. In addition, or in the alternative, a conventional shoe 19 or saddle may be affixed to the ski 10. The shoe or saddle is essentially an open channel that is affixed near the middle of the top surface of the ski 10, and may also be used to affix the ski 10 to the snowmobile. Whenever reference is made hereinafter to “front” or “rear” views of the various components and assemblies, “front” refers to the view facing the leading edge 14 and “rear” the view facing the trailing edge 16, when the component or assembly is incorporated into the ski 10.

In the embodiment shown in FIGS. 1-3, two vents 40 are inserted into openings 28 in the ski 10. As the vented ski 100 moves along the snow the loose snow that would otherwise become impacted beneath the ski, particularly in the corner that is created at the intersection of the keel 26 and bottom surface 24, enters the vents 40 through the openings 28 and is forced through the vents 40 by the movement of the snowmobile, exiting through the vent 40 above, out, and over the ski 10. Depending on the design of the ski 10, the vents 40 may be secured using conventional means, such as threaded fasteners, to the sidewalls 18 and/or the shoe 19.

FIGS. 4-6 and 12-14 illustrate the vents 40. The vents 40 have an approximately oblong shape with at least a guide surface 46. In the embodiment shown in FIGS. 4-6 the guide surface 46 is a top surface 46 and the vents 40 also include a bottom surface 44 that are connected by an inner sidewall 52 and an outsider sidewall 54. A front end 43 of the vent 40 is closed, and shaped in a curved aerodynamic manner. A back end 45 of the vent is at least partially open and serves as at least part of an exhaust vent 48. An opening 42 on the bottom surface 44 allows the snow to enter the vent 40 as the ski moves across the snow, and the closed top surface 46 guides the snow to the exhaust opening 48 on the vents 40. The inner sidewall 52 and the outer sidewall 54 are positioned on the inside of the ski 10 and the outside of the ski 10, respectively, and also help to direct snow to the exhaust opening 48.

The vents 40, however, do not necessarily require the bottom surface 44 and both an inner sidewall 52 and an outer sidewall 54. FIGS. 12-14, for example, illustrate a vent 40 with no bottom surface, such that the snow simply enters the vent as the ski moves along the ground and is directed out and away from the ski by the guide surface 46. In this embodiment, an inner sidewall 52 is used to connect the vent 40 to the ski 10, however, this is a design choice as the vent 40 may also be formed as a part of the ski 10 or it may be attached in other manners, for example, the guide surface 46 may overlap a top surface of the ski 10 and be affixed to the top surface of the ski 10. An outer sidewall 54 is also shown, however, this too is an optional design choice. The outer sidewall 54 may also be a fin or blade 58 that extends beneath the bottom surface of the ski and helps the directional control the ski. This embodiment also illustrates a design that may be used in conjunction with a conventional deployable wheel assembly 90, for example, the deployable wheel system disclosed in U.S. Patent Application Publication 2019-0176867 A1 which is hereby incorporated by reference in full.

The exhaust opening 48 may be positioned in a number of locations depending on the manner in which the designer wishes to have the snow exit the ski 10. In general, the vents 40 are constructed to either: a) divert snow out and away from the snowmobile; b) to direct snow inwards towards the snowmobiles track so as to allow the snow to cool the track; or c) to direct snow away from each ski regardless of its effect on the snowmobile.

For example, as shown in FIG. 1, the exhaust opening 48 may be an opening 48A in the inner sidewall 52 or the exhaust opening 48B may be in the outer sidewall. In the first instance the outer sidewall 54 is closed while in the second example the inner sidewall 52 is closed. Attaching this version of the ski 10 to the left side of the snowmobile causes it to direct snow away from the snowmobile, whereas attaching it to the right side causes it to direct snow towards the snowmobiles track. Using vents that are a mirror image of the vents shown in FIG. 1, and attaching that ski to the opposite side of a snowmobile, causes both skis to vent snow towards or away from the snowmobile as desired. Alternatively, a ski 10 may have two vents that each direct snow out and away from the ski so as to remove as much snow as possible from the ski.

In each case, the back end 45 of the vent 40 is open. Additionally, a vent 40 that is designed to direct snow towards the snowmobile track is likely short and small relative to the overall dimensions of the vent 40, thus causing the vented snow to be relatively concentered such that it exits the vent 40 with a relatively high degree of speed and targeted towards the track. The exhaust vent 40 that is designed to send snow outside of the ski 10 is, conversely, relatively long with approximately one half of the outer sidewall 54 being open, as shown by 48B in FIG. 1, such that the snow pours out of the vent 40 as the ski 10 moves across the snowy surface.

In that regard, the sidewalls 52, 54 may be completely open to allow for a greater space for the vented snow to exit the vent 40, or the sidewalls 52, 54 may be partially closed to allow for greater control of the direction of the vented snow. For example, when it is preferable to control the direction of the vented snow, such as to direct snow under or into the snowmobile track to act as a cooling agent, having an opening that is mostly closed but curved to direct the snow towards the track may be preferable. To that end, a directional guide member 56, shown in FIGS. 4, 6, and 14, may also be provided to further control the direction of the vented snow by guiding the vented snow to a particular spot, i.e. the track. The directional guide member 56 may also have a curved shape that causes the snow to exit the vent 40 in the shape of a vortex.

As previously noted, the outer side 54 of the vent 40 may also have a section 58 that extends beneath the bottom surface of the ski 10 as a blade or a fin. This blade 58 helps the directional control exerted by the ski as it moves along the snow and it also helps to funnel snow into the vent 40. The blade 58 may be made as a part of the vent 40, as a part of the ski 10, or it may be a standalone component that may be separately attached to the vent 40 and/or the ski 10 by any suitable conventional means. In the Figures this blade 58 is shown as an integral part of the vent 40, however, it does not necessarily need to work in conjunction with a vent and may alternatively be used independently with any form of suitable ski, formed as an individual component that is attachable to ski or formed as a part of the ski. The blade may vary in length, with a reasonable length being anywhere between 6 and 12 inches. The blade 58 may also have a varying height/depth, likely extending no further than the depth of the keel.

In the embodiment shown in FIGS. 1-3, the vents 40 are inserted into the openings 28 in the ski 10 and affixed to the shoe 19, however, they may also be affixed to the outer side of the ski 10, likely being attached to the sidewalls 18 and/or having fasteners that extend to the shoe 19, as shown in FIG. 11. The vents 40 may be provided as an add-on, such that they may be affixed to or inserted into an existing ski, or, alternatively, the vents may be incorporated as a manufactured component when the ski it is originally created. In most instances snowmobile skis have a kingpin that is used to attach the skis to the snowmobile's steering assembly (not shown). This kingpin, or a modification thereof, may also be used, either on its own in addition, to secure the vents 40 onto or into the ski 10.

FIGS. 7-10 illustrate a modified ski keel 70. The modified keel 70 is significantly shorter than the conventional keel, and rather than running the length of the ski, or nearly the length of the ski, the modified keel 70 generally has a length that is less than one third the length of the entire ski and often less than one quarter of the length of the ski. For example, for a ski that has a length of approximately 45 inches, the modified keel has a length between approximately 6 inches and approximately 15 inches, preferably between 10 inches and 14 inches, and most preferably approximately 12 inches. The modified keel 70 may be slopped or tapered downward toward the ski on the front end 72 and back end 74, as shown in FIGS. 8 and 9.

For a modified keel 70 that is approximately 12 inches in lengths the non-tapered, flat, portion of the keel measures approximately 5 to 7 inches with slopes on either end of the keel that are approximately equal in length. The front end 72 of the keel 70 is angled inward, similar to the point of an arrow head. In most instances snowmobile skis have a kingpin that is used to attach the skis to the snowmobile's steering assembly (not shown). The modified keel 70 is approximately centered in the flat portion of the ski bottom, generally very near to the skis point of attachment to the kingpin. The modified keel 70 is also deeper than the traditional keel, in general having a depth between approximately 2 and approximately 4 inches. The width of the modified keel 70 is similar to the width of conventional ski keels, often around 1 inch.

The bottom of the keel 76 may be a single unitary piece, likely having a carbide runner on the bottom, or it may have two sides or protrusions 78, 82, with a channel formed between them. In the embodiment shown, each side 78, 82, has a carbide runner 84. The carbide runner 84 may also be replaced by a piece of hardened steal. The protrusions may also be carbide runners that are affixed directly to the keel to form a channel.

The shortened length of the keel 70 causes the ski to be significantly easier to turn and manipulate despite the added depth of the keel, with the added depth still providing greater control. When used with the vents 40 the lower sections 58 on the vents 40 provide additional bite or grip on the snow so as to provide the operator with additional directional control of the snowmobile in spite of the modified keel 70.

It is understood that the embodiments described herein are merely illustrative of the present invention. Variations in the construction of the vented ski and modified keel may be contemplated by one skilled in the art without limiting the intended scope of the invention herein disclosed and as defined by the following claims. 

What is claimed is:
 1. A vent adapted for use in venting snow through a ski, the vent comprising: a guide surface that allows snow to enter the vent and an exhaust opening that allows snow to exit the vent; and wherein the vent is insertable in the ski or attachable to the ski.
 2. The vent of claim 1, further comprising an outer sidewall that is a blade that extends beneath a bottom surface of the ski.
 3. The vent of claim 1, wherein the exhaust opening is an opening in a tail end of the vent and wherein a front end of the vent is closed.
 4. The vent of claim 3, further comprising a directional guide member affixed to either an inner sidewall or an outer sidewall of the vent.
 5. A vented ski for a ski-mounted vehicle that vents snow from a ground surface as the ski-mounted vehicle travels along the ground surface, the vented ski comprising: a ski body having a leading end, a trailing end, a top ski surface and a bottom ski surface that is a glide surface; one or more vents, each vent having a guide surface that allows snow to enter the vent and pass through the vent, and an exhaust opening that allows snow to exit the vent; and wherein each of the one or more vents is inserted into the ski body or attached to the ski body or formed as a part of the ski body.
 6. The vented ski of claim 5, wherein at least one of the one or more vents is affixed to the outside of the ski body.
 7. The vented ski of claim 5, further comprising the ski body having a number of openings that correspond in number to the one or more vents, and wherein each of the one or more vents is positioned within one of the one or more openings.
 8. The vented ski of claim 5, wherein the exhaust opening extends out of the trailing end of the ski.
 9. The vented ski of claim 5, further including a deployable wheel assembly.
 10. The vented ski of claim 5, further including a keel that has a length that is less than approximately 30% of the length of the ski body.
 11. The vented ski of claim 10, further including a keel that has a length that is between approximately 6 inches and approximately 14 inches in length and that has a depth of between approximately 2 inches and approximately 4 inches.
 12. The vented ski of claim 5, wherein at least one of the one or more vents has a blade that extends beneath the bottom surface of the ski body.
 13. A ski having a modified keel, the ski comprising: a ski body having a leading end and a trailing end, and a bottom surface that is a ski glide surface; and where the bottom surface has a keel, the keel having a length that is less than approximately 30% of the length of the ski.
 14. The ski of claim 13, wherein the keel has a length that is less than approximately 20% of the length of the ski.
 15. The ski of claim 13, wherein the keel has a length between approximately 6 inches and approximately 14 inches and having front and back ends that are tapered, and having an approximately flat section between the front and back ends that is between approximately 6 inches and approximately 10 inches in length, the keel further having a depth that is between approximately 2 inches and approximately 4 inches.
 16. The ski of claim 13, wherein the keel has a length between approximately 10 inches and approximately 12 inches in length and wherein the flat section between the tapered section is between approximately 5 and 7 inches in length.
 17. The ski of claim 13, wherein the keel has two protrusions that form a channel.
 18. A ski for a ski-mounted vehicle, the ski comprising: a ski body having a leading end, a trailing end, a top ski surface, and a bottom ski surface that is a glide surface; and at least one blade that extends beneath the bottom surface of the ski body.
 19. The ski of claim 18, wherein the at least one blade includes two blades that are positioned on outer sides of the ski.
 20. The ski of claim 19, the ski further including a keel and wherein each of the two blades has a depth that is approximately equal to the depth of the keel. 